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    <title>加水</title>
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    <h1>加水</h1>
    <h3>目标：2L</h3>

    <div class="cup">
        <div class="remained" id="remained">
            <span id="liters">2l</span>
            <small>剩余</small>
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        <div class="percentage" id="percentage"></div>
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    <p class="text">选择加多少水</p>

    <div class="cups">
        <div class="cup cup-small">250 ml</div>
        <div class="cup cup-small">250 ml</div>
        <div class="cup cup-small">250 ml</div>
        <div class="cup cup-small">250 ml</div>
        <div class="cup cup-small">250 ml</div>
        <div class="cup cup-small">250 ml</div>
        <div class="cup cup-small">250 ml</div>
        <div class="cup cup-small">250 ml</div>
    </div>


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